package cn.me.demo2;

/**
 * @author jia
 * @date 2021/2/19
 */

import cn.me.demo1.TestThread2;
import com.sun.org.apache.xpath.internal.operations.Bool;
import org.apache.commons.io.FileUtils;

import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.util.concurrent.*;

/**
 * 线程创建方式三：实现callable接口
 * 好处：
 * 1.可以定义返回值
 * 2.可以抛出异常
 */
public class TestCallable implements Callable<Boolean> {

    private String url;//网络图片地址
    private String name;//保存的文件名

    public TestCallable(String url, String name) {
        this.name = name;
        this.url = url;
    }

    @Override
    public Boolean call() {
        WebDownloader webDownloader = new WebDownloader();
        webDownloader.downloader(url, name);
        System.out.println("下载文件名为：" + name);
        return true;
    }

    public static void main(String[] args) throws ExecutionException, InterruptedException {

        TestCallable t1 = new TestCallable("https://www.kuangstudy.com/assert/course/c1/01.jpg", "1.jpg");
        TestCallable t2 = new TestCallable("https://www.kuangstudy.com/assert/course/c1/01.jpg", "2.jpg");
        TestCallable t3 = new TestCallable("https://www.kuangstudy.com/assert/course/c1/01.jpg", "3.jpg");

        //创建执行服务
        ExecutorService ser = Executors.newFixedThreadPool(3);
        //提交执行
        Future<Boolean> r1 = ser.submit(t1);
        Future<Boolean> r2 = ser.submit(t2);
        Future<Boolean> r3 = ser.submit(t3);
        //获取结果
        boolean rs1 = r1.get();
        boolean rs2 = r2.get();
        boolean rs3 = r3.get();
        //关闭服务
        ser.shutdownNow();
    }
}

class WebDownloader {
    public void downloader(String url, String name) {
        try {
            FileUtils.copyURLToFile(new URL(url), new File(name));
        } catch (IOException e) {
            e.printStackTrace();
            System.out.println("IO异常");
        }
    }
}
